Luigi is the second and yonger of the two Mario brothers, Princess Daisy's husband, and one of the main characters of the IG-88's Adventures Series. Along with his brother, the two have been through many adventures to save the Mushroom Kingdom and it's many other lands. Both he and his brother share one common trait: they both use power-ups like Power Stars, Mega Mushrooms, Penguin Suits, Fire Flowers, Ice Flowers, Propeller Mushrooms, Super Mushrooms, etc.

He is the adopted uncle of Takato Matsuki, Lilo Pelekai, and Nani Pelekai. He is voiced by Charles Martinet.